QA:Testcase CoreOS switch stream

Description

This tests whether an existing Fedora CoreOS instance running on the stable stream can switch to the next stream.

Setup

1. Have access to a (or install a new) FCOS instance running the stable stream.

How to test

1. Verify that your FCOS system is running on stable:

   $ sudo rpm-ostree status
   State: idle
   AutomaticUpdates: disabled
   Deployments:
   ● ostree://fedora:fedora/x86_64/coreos/stable
                      Version: 31.20200505.3.0 (2020-05-19T13:39:46Z)
                       Commit: 01f074cc6cd88d8d2b43f821da692f2367c101eb4377802cb35092bde0ef02f7
                 GPGSignature: Valid signature by 7D22D5867F2A4236474BF7B850CB390B3C3359C4
   

   The black circle ● shows the currently booted tree (if you see multiple deployments available). The current tree should show fedora/x86_64/coreos/stable. The version may differ from the above output.

2. Follow the Update Streams documentation to switch your system to the next stream.
   • A package difference should be displayed during the switch operation for you to review.
3. Reboot
4. Verify that your system is now running on the next stream:

   $ sudo rpm-ostree status
   State: idle
   Deployments:
   ● ostree://fedora:fedora/x86_64/coreos/next
                      Version: 32.20200517.1.0 (2020-05-19T09:23:58Z)
                       Commit: 7c23c4735fb3c541586f0a4d3ca956ef93ef7d76f00a19bccf51460bafa7ee97
                 GPGSignature: Valid signature by 7D22D5867F2A4236474BF7B850CB390B3C3359C4
   

   The current tree should show fedora/x86_64/coreos/next. The version may differ from the above output.

Expected Results

1. The system successfully reboots and runs on the next stream.
2. The system is functional (you can connect the same way as before, your services are running as before).
3. The linked documentation is clear, all steps are understandable, and nothing important is missing from it.

Optional

1. Before switching to the next stream, try for example creating containers or configuring a service and verify that the changes are successfully carried over after switching.
2. After switching to the next stream, attempt both a temporary and a permanent manual rollback. After each rollback, verify that your system booted with the correct filesystem tree using sudo rpm-ostree status.